What is the meaning of the word pace in the expression "pace Karl Popper" for example?

I often find on the web pages a quote followed by "pace .... and the name of the person who it is attributed to". What is the meaning of the word pace in this context?

1. “to quote” or
2.“with thanks to”?
3. another and what?

10 points for fastest answer with a good (reliable) source
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